* nitoyon-slugify-new-param:
Remove superfluous Sass declarations.
Move the slugify options out to their own section so as to fix the formatting.
Document the mode parameter of slugify Liquid filter
Add tests for mode parameters of slugify Liquid filter
Add mode parameter to slugify Liquid filter
Conflicts:
lib/jekyll/utils.rb
---> Hadn't added UTF-8 support in nitoyon's PR.
To use, just include `Jekyll::LiquidExtensions` as you please:
```ruby
class SayHi < Liquid::Tag
include Jekyll::LiquidExtensions
def initialize(tag_name, markup, tokens)
@markup = markup.strip
end
def render(context)
"hi #{lookup_variable(context, @markup)}"
end
end
```
Fixes#2071.
